Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare readOnlyHint, idempotentHint and destructiveHint=false, so the description's 'Read-only' merely restates structured data. It adds genuine context that returned times are real slots and scoped to the next few weeks, but discloses nothing about result format, slot count, or failure modes.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

Two short sentences with zero filler; the resource is front-loaded and the usage rationale follows immediately.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a small read-only lookup with full schema coverage, complete annotations, and no output schema, the description covers what and when adequately. Only minor gaps remain around return shape and rate/scope limits, which the annotations largely mitigate.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 100%, so both parameters (days, timezone) are already fully documented in the schema. The description adds no parameter-level detail beyond what the schema provides, which is the baseline case.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description names the resource precisely (free consultation slots over the next few weeks), so the agent knows this returns availability rather than booking one. The verb is implied rather than stated, but the output semantics are unambiguous and distinct from siblings like request_consultation.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Does the description explain when to use this tool, when not to, or what alternatives exist?

It gives a clear directive plus rationale: call this before proposing a time so the suggestion is real rather than invented. That establishes ordering relative to a booking step, though it does not name an alternative tool or an explicit when-not-to-use condition.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.